The relationship between PKHeX and the competitive Pokémon scene (VGC) is complex. Training a perfect team for official tournaments can take hundreds of hours of repetitive "grinding" for Hidden Abilities and specific IVs.
While PKHeX is a powerful utility, it requires a way to access save files from a console. For modern systems like the 3DS or Switch, this typically involves using custom firmware (CFW) to export the save to an SD card. The relationship between PKHeX and the competitive Pokémon